
You want to be careful to not crimp the radius of the actual fold too tightly but normally you'd go in with tongs or a folding tool of the some sort and close up that hem so it's tighter against the starter piece.
There are not a lot of options. I have seen people leave a little flap and fold it over to close the opening but, if you live in an area where you get snow, snow will open it up after a couple of seasons. One option is to fill the hole with color matched sealant. I notice the rust already. Do you know how they cut these panels? What environment are you located in?
Attached is diagram from a metal vendor, suggesting a flap.
Here's an article on the subject of edge rust from MBCI: https://blog.mbci.com/cutting-metal-panels-on-site/
"Cutting Metal Panels Properly On Site
Posted on October 17, 2019 by kbuchinger". Basically they want cuts that spread some of the panel zinc to the cut edge.
If it were my roof I'd hit the rusty tabs with a sander to get the metal shards off, then hold foam over the rib and paint cold galvanizing primer in a neutral color.
We are in the process of having a standing seam (no exposed fasteners) metal roof installed. Is there a proper way to finish/tuck/seal the exposed edge of the ridge near the hemmed end? Frankly this rough cut end looks like crap and I’m worried about rust.
Thank you. We are getting them to come re-crimp the hem up tighter where needed. I'm sorry--I was a bit ambiguous with my amateur terminology.
I am concerned about the vertical ridge/seam right at the hemmed edge--where the overlock occurs. Here's a closer pic. Is that normal? Totally exposed?
I'm located in St Louis MO. Not a lot of snow--but pretty extreme temperature swings, rain, wind, etc.
They used an angle grinder to make all the cuts. I didn't know that color matched sealant was an option.